Zeller: Contributions to Oregon Fungi 181 



85. Boletus Zelleri Murrill. 



In coniferous woods. Corvallis. October to November. Frequent. 



86. Boletinus cavipes Opat. 



Under birch trees, Oregon Agricultural College campus, Corvallis. 

 October. Infrequent. No. 2052. 



This plant has not previously been reported west of the Rocky Mts. 



6. Family Polyporaceae 



87. Cryptoporus volvatus (Peck) Shear. 



On Tsuga, Pseudotsuga and Abies in the Coast Range Mountains. 

 September to November and spring. Frequent. 



88. Fomes annosus (Fries) Cooke. 



On Pseudotsuga taxifolia (log), Philomath- Alsea road. November. 

 Infrequent. Nos. 1759, 2140. 



89. Fomes applanatus (Pers.) Wallroth. 



On wood of various deciduous trees, usually saprophytic but un- 

 doubtedly parasitic on the collar and roots of Italian prune trees. Fre- 

 quent. Fall and spring. No. 1959- 



The form of this fungus having a white context (Fomes leucophaeus 

 Mont.) is very commonly found in western Oregon. This form has been 

 observed upon thoroughly water-soaked, decayed wood of Populus and 

 Acer. Specimens which were brought into the laboratory to dry became 

 the usual brown color which progressed upwards from the tubes as the 

 fungus dried out. Perhaps this white color is associated with a thor- 

 oughly saturated condition which does not allow of the usual oxidation. 



For two years the progress of root rot in prune trees caused by F. 

 ap'planatns has been watched with interest. In November, 19 19, an 

 orchard of about 20 acres in Douglas County was visited and many trees 

 - had blown over in a recent wind storm. The trees had blown over while 

 in full leaf and some in full fruit. An examination of the fallen, trees 

 to ascertain the cause of root weakness revealed a decayed condition of 

 the roots. Many roots exhibited resupinate fruiting bodies of F. ap- 

 planatus and all of the fallen trees (about 20) had the white butt-rot 

 characteristic of F. applanatus decay. In . the spring of 1921 the same 

 orchard was visited and many more trees were observed with fruiting 

 bodies on the lower portion of the trunk and on the roots. Such trees 

 had very loose footing. Usually the infection could be traced from 

 wounds near the base of the trunk or on shallow roots probably caused 

 by cultivation machinery. The trees were in good soil and apparently 

 otherwise in good vigor except that "the upper trunk and larger branches 

 showed heart rot due to Trametes carnea. In this case Fomes applanatus 

 is at least a destructive facultative parasite. 



90. Fomes igniarius (L.) Gillet. 



On apple trees, Canyonville, Douglas County, and Corvallis. May and 

 February. Infrequent. Nos. 1900, 1921. 



91. Fomes pinicola (Swend.) Cooke. 



On peach and prune trees, western Oregon. Frequent. Nos. 1786, 

 1815. 



